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Class-D Garage Band Amplifier

Class-D Garage Band Amplifier. Team: Aaron Danielson, Robert Mann, Randall Newcomb, Scott Russell Sponsor: Nigel Thompson. Overview. The Purpose of the Class-D Garage Band Amplifier Requirements and Stretch Goals System Concept System Block Diagram Sampling and Bitrate Constraints

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Class-D Garage Band Amplifier

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  1. Class-D Garage Band Amplifier Team: Aaron Danielson, Robert Mann, Randall Newcomb, Scott Russell Sponsor: Nigel Thompson

  2. Overview • The Purpose of the Class-D Garage Band Amplifier • Requirements and Stretch Goals • System Concept • System Block Diagram • Sampling and Bitrate Constraints • Task Breakdown • Budget • Project Schedule

  3. Purpose • Class D Amplifier Power Efficiency • Price Point • Open Source • Customizability

  4. Requirements • An amplifier output will be driven by an FPGA • The output stage will be a PWM H-bridge amplifier • High quality audio • Low cost • High efficiency • The power supply will be efficient and low cost • The amplifier will output more than 100W RMS • … Stretch Goals • An enclosure will be constructed to house the amplifier, FPGA and speaker • A more power amplifier will be implemented

  5. System Concept Images from Google Image

  6. System Block Diagram

  7. Description of Major Tasks • Design a Top Level Testbench • Contains all the key modules that connect the DSP and PWM. • Implement microprocessor. • Digital Signal Processor • Design 2 filters – one each for bass & treble. • Interface with LCD & rotary dial for user input. • H-Bridge Controller • Design code to control H-bridge IC. • Integrate H-Bridge into FPGA clocking and control. • Amplifier • Design an H-bridge. • Implement and test the amplifier • Speaker Enclosure • Build the box • Shield the box for RF radiation • Design bandpass filters for the selected speaker

  8. Bitrate & Sample Rate Comparison – CD Quality

  9. Bitrate & Sample Rate Comparison – Low Sample Rate

  10. Bitrate & Sample Rate Comparison – Low Bit Depth

  11. Bitrate & Sample Rate Comparison – A Good Compromise

  12. Budget

  13. Project Schedule

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